Stone Shop

Stone Shop is one of the major shops in Anthian City - Shopping District. It displays and sells numerous valuable stones and gems. This shop offers all 18 kinds of Gems, 5 basic Evolutionary Stones and nearly 20 kinds of Mega Stones.

Gems
Gems are one-use held items for increasing the damage of an attack, which corresponds to the gem's type, by 30%. The gem is consumed before the attack is unleashed. One of the most famous usage is to pair up Flying Gem with the attack Acrobatics, which inflicts double damage if the user has no held items -- and the Flying Gem is consumed before the move checks for held items, boosting the damage further. All 18 kinds of Gems can be purchased here, including the latest addition Fairy Gem.

Evolutionary Stones
5 kinds of basic Evolutionary Stones are sold here, but they can be found by underwater mining in Lagoona Trenches as well. Sun Stone, Shiny Stone, Dusk Stone, Oval Stone and Dawn Stone are not for sale here, while the newly introduced Ice Stone is only available after player completes 2016 Christmas Event in Anthian Park.

Mega Stones
19 kinds of Mega Stones can be bought here. Each kind of Mega Stone is for a specific Pokémon to hold, in order to achieve Mega Evolution. These are the most expensive items in-game, and players are recommended to grind for money from Rising Star Darren on Route 11 if they are too broke to buy these.

Trivia

 * When Gems were first implemented in core series games Pokémon Black, White, Black 2 and White 2, they boosted damage by 50%. The increase has been reduced to 30% from Pokémon X and Y onwards, and the change is carried here.
 * The Fairy Gem, despite being added in Pokémon X and Y following the introduction of Fairy-type, was actually unobtainable in those games, as well as Pokémon Omega Ruby and Alpha Sapphire; however, it is obtainable in this game.